Ricoh FW780 Service Manual - Page 237

2. DETAILED SECTION DESCRIPTIONS 2.1 DRUM 2.1.2 DRUM DRIVE DRUM Detailed Descriptions [I] [H] [D] A252D502.WMF [A] [G] [F] [E] [B] - A252 copier only - [C] [K] [J] A252D503.WMF The OPC drum [A] is 80 millimeters in diameter and 970 millimeters long. It turns constantly when the main motor [B] is on. When the main motor turns on, the drive is transmitted to the drum as follows: main motor drive gear [C] ⇒ idle gears [D] ⇒ drum drive gear [E] ⇒ drum flange [F] ⇒ drum When the drum knob is tightened, the right flange presses firmly against the drum so that the drum is held tightly between the flanges. The drum and flanges turn together when the main motor is on. At this time, the drive is also transmitted to the original feed rollers [G] through the original feed drive pulley [H] and belt [I] (A251 copier). The original feed rollers [J] (original entrance and rear rollers) for the A252 copier are driven by the original feed motor [K]. SM 2-1 A251/A252